Exercise: Engineering Materials

Questions for: Engineering Materials

The percentage of carbon in cast iron varies from
A:
0.1 to 0.5
B:
0.5 to 1
C:
1 to 1.7
D:
1.7 to 4.5
Answer: D
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Smelting is the process of
A:
removing the impurities like clay, sand etc. from the iron ore by washing with water
B:
expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C:
reducing the ore with carbon in the presence of a flux
D:
all of the above
Answer: C
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Malleable cast iron is produced
A:
by adding magnesium to molten cast iron
B:
by quick cooling of molten cast iron
C:
from white cast iron by annealing process
D:
none of these
Answer: C
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The hardness is the property of a material due to which it
A:
can be drawn into wires
B:
breaks with little permanent distortion
C:
can cut another metal
D:
can be rolled or hammered into thin sheets
Answer: C
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Shock resisting steels should have
A:
low wear resistance
B:
low hardness
C:
low tensile strength
D:
toughness
Answer: D
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